"Steps to replace the cartridge of HP OFFICEJET J4580
Open the access door of the cartridge until it latches to its position.Once it reaches to the center of the position, remove the empty cartridge or the one you want to replace from its slotOpen the new cartridge, remove the plastic tape from its head.Put it into the empty slot. To make sure it is correctly installed, push down until you hear a click.Close the access door